Research On Orbital Station Area Morphological Evolution

The urban rail system is independent of the street network,which is an important infrastructure to relieve traffic congestion,effectively improve the accessibility of middle and long distance travel of citizens,and improve the efficiency of urban operation.Its construction process is affected by the existing structural environment of the city,but at the same time,after its completion,it also has a direct impact on the change of urban form,especially on the urban space development of the orbital station area(the area around the orbital station is greatly affected by rail transit).On the macro level,the rail transit system enhances the convergence of urban functions to all levels of the center.At the micro and medium level,orbital station as the core attracts the surrounding economic,social and cultural activities and gathers them into a close spatial form.From the perspective of the relationship between urban spatial form and structure,rail transit effectively guides the evolution of urban space.First of all,by reviewing and sorting out relevant literature,this study defines the relevant concepts of the research,that is,the orbital station domain and spatial form,etc.,and determines the research content as the characteristics and rules of orbital station domain morphological evolution,including research methods,research purposes,research significance and research framework.Secondly,taking Guangzhou Rail Transit Line 5 as an example,24 stations of the line were selected as the research objects.With the help of urban morphological geoplane research method and morphological quantitative analysis,the spatial morphological characteristics of the stations were focused and the characteristics of "property parcel","street system" and "architectural form" within each station were studied.At the same time,the time slice historical maps of 2005,2010,2015 and 2020 are collected,and the morphological evolution and changes of the orbital station area are explored through qualitative and quantitative visualization methods,and the characteristic rules are summarized,so as to enrich the methods and perspectives of urban morphology research and provide reference for the coordinated development of rail transit and urban construction in the future.According to the index system construction of land,street and building,the content of each form element is presented in fine detail,which enhances the scientific and rigorous research of this subject.It promotes the development of urban morphology from qualitative research to quantitative research and provides a method reference for the comparative study of multi-type regional morphology.The research results show that the comparative study of the index data of the three aspects of the orbital station area shows that the old city,the old central district,the new central district and the new development district of Guangzhou from west to east have different morphological characteristics.Macroscopically,there are three similar regions: Yuexiu District,west Tianhe District,east Tianhe District and Huangpu District.Morphological differences reveal that the spatial morphology and landscape of cities are different under different historical backgrounds,development concepts,lifestyles and construction methods.In terms of time dimension,the old urban areas such as Yuexiu and Liwan changed little,while new districts such as Tianhe and Huangpu changed a lot.The intensity of development and construction is also different from that before and after the completion of the track line,and the development along the track line gradually moved eastward.This study not only explores the urban morphological characteristics of the orbital station area,but also contributes to the extension of urban morphological theory and research methods,and provides useful references for the urban space design and transportation planning of the station area.It is of great significance for promoting the expansion of urban scale relying on rail transit and guiding the high-quality development of the city in the future.